This is looks great, but i'm pretty sure its completely cheated and not quite what Blueberry meant.

If you only look through the centre, its got all the layers it claims. However, if you look at some of the gaps to the side of the centre "tunnel", you can clearly see that the square gaps are in places all black, when the depth/layers of the effect should be reproduced throughout to minimise seeing black.

I could be wrong of course, but i'm guessing that outside of the centre, not all the faraway layers are being plotted, using the centre to obscure it.